Add custom subclass to revert mapping

To be able to revert the custom mappings down by config-download, let's
add some tripleo specific subclasses which will be available in the
registry.

Change-Id: I6bd4107e8e1a6a9abc38d2dca7a91a6823f8b6c2
Related-Bug: #1758065

undercloud_heat_plugins/config.py

@@ -0,0 +1,30 @@
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from heat.engine.resources.openstack.heat import software_deployment
+from heat.engine.resources.openstack.heat import structured_config
+
+
+class SoftwareDeployment(software_deployment.SoftwareDeployment):
+    """A custom subclass to allow reverting replacement."""
+
+
+class StructuredDeployment(structured_config.StructuredDeployment):
+    """A custom subclass to allow reverting replacement."""
+
+
+def resource_mapping():
+    return {
+        'OS::TripleO::Heat::SoftwareDeployment': SoftwareDeployment,
+        'OS::TripleO::Heat::StructuredDeployment': StructuredDeployment
+    }